Advertising Poster Young Bloods Kaleidoscope Hour Glass Psychedelic Nude. Original vintage advertising poster for Young Bloods, Kaleidoscope, and Hourglass music concert at the Avalon Ballroom, featuring an illustration of a nude blonde haired lady above a blue castle with dotted brown and yellow patterns and flowers below. The Avalon Ballroom was a music venue in the Polk Gulch neighbourhood of San Francisco, California, at 1244 Sutter Street. The space operated from 1966 to 1969, at the height of the counterculture movement. Excellent condition. Country of issue: USA, designer: John Thompson, size (cm): 51x35, year of printing: 1968.